It's a really great phone for those who need a phone to call and send messages. I have had this phone for 4 years and have never had ANY problems with it. The battery is great. I does very simple things.

Too many annoying deficiencies with the 400x. Can't insert numbers from phonebook into texts; you can only send visitor cards which don't seem to be recognised by other phones. Sent Items folder fills up and then stops keeping your sent messages so you have to go back in and delete the sent messages every time rather than just keeping the newest ones and deleting the oldest. No Stop Watch! Organiser is a pain to use. Volume can't be set, every time you receive or make a call the volume is set to 5/7 and you have to turn up everytime for every call (the volume even at max is quite low). Can't change message vibration type. Its either on or off. There's just enough wrong with this phone to irritate a person into buying another phone within a year. That seems to be its design concept.